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FAIR VALUE MEASUREMENT - Fair value of derivative instruments on the consolidated balance sheets (Details) - Not designated as hedging instruments - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | $ 7,977 | $ 27,111
Total derivatives liability | 13,698 | 6,480
Derivative assets - current | Foreign exchange forward contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 4,166 | 12,316
Derivative assets - current | Foreign exchange option contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 1 |
Derivative assets - current | Commodity hedge |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset |  | 3,416
Derivative assets - current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 594 | 468
Derivative assets - non-current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives asset | 3,216 | 10,911
Derivative liabilities - current | Foreign exchange forward contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability | 13,480 | 5,120
Derivative liabilities - current | Foreign exchange option contracts |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability | $ 218 |
Derivative liabilities - current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability |  | 1,001
Derivative liabilities - non-current | Interest rate swap |  |
Effect of fair value of derivative instruments on the consolidated balance sheets |  |
Total derivatives liability |  | $ 359

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